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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 256 |
| 3 | 196916 |
| 4 | 1970169608 |
| 5 | 257884387013510 |
| 6 | 442453214562156086168 |
[4,256,196916,1970169608,257884387013510, 442453214562156086168] |